This episode is brought to you by the number 19 and associated segues … Now hear this: Why do we like to listen to music loudly? What have you done physically when you’ve damaged your hearing? Just how does the ear work and what role do the ‘hairs’ inside play and, why do we speak more loudly if we’ve had too much alcohol? Twitter Time this week: Olber’s Paradox and why is the sky dark at night and not just a blanket of white light?